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- EMDB-36317: Cryo-EM structure of niacin bound ketone body receptor HCAR2-Gi s... -

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Entry
Database: EMDB / ID: EMD-36317
TitleCryo-EM structure of niacin bound ketone body receptor HCAR2-Gi signaling complex
Map data
Sample
  • Complex: niacin-bound HCAR2 in complex with Gi heterotrimer
    • Complex: Nicotinic acid receptor in complex with Gi heterotrimer
      • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
      • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
      • Protein or peptide: Guanine nucleotide-binding protein G(i) subunit alpha-1
      • Protein or peptide: Hydroxycarboxylic acid receptor 2
    • Complex: scFv16
      • Protein or peptide: scFv16
  • Ligand: NICOTINIC ACID
  • Ligand: CHOLESTEROL
  • Ligand: water
KeywordsComplex / Agonist / MEMBRANE PROTEIN
Function / homology
Function and homology information


neutrophil apoptotic process / nicotinic acid receptor activity / Hydroxycarboxylic acid-binding receptors / positive regulation of neutrophil apoptotic process / Class A/1 (Rhodopsin-like receptors) / positive regulation of adiponectin secretion / negative regulation of lipid catabolic process / regulation of eating behavior / adenylate cyclase inhibitor activity / T cell migration ...neutrophil apoptotic process / nicotinic acid receptor activity / Hydroxycarboxylic acid-binding receptors / positive regulation of neutrophil apoptotic process / Class A/1 (Rhodopsin-like receptors) / positive regulation of adiponectin secretion / negative regulation of lipid catabolic process / regulation of eating behavior / adenylate cyclase inhibitor activity / T cell migration / positive regulation of protein localization to cell cortex / positive regulation of relaxation of smooth muscle / Adenylate cyclase inhibitory pathway / D2 dopamine receptor binding / adenylate cyclase-inhibiting dopamine receptor signaling pathway / adenylate cyclase-inhibiting serotonin receptor signaling pathway / G protein-coupled serotonin receptor binding / regulation of G protein-coupled receptor signaling pathway / cellular response to forskolin / regulation of mitotic spindle organization / mast cell degranulation / chemokine-mediated signaling pathway / establishment of mitotic spindle orientation / neuropeptide signaling pathway / Regulation of insulin secretion / response to prostaglandin E / positive regulation of cholesterol biosynthetic process / cell junction / G protein-coupled receptor binding / response to peptide hormone / G-protein beta/gamma-subunit complex binding / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway / adenylate cyclase-modulating G protein-coupled receptor signaling pathway / Olfactory Signaling Pathway / Activation of the phototransduction cascade / G protein-coupled acetylcholine receptor signaling pathway / G beta:gamma signalling through PLC beta / Presynaptic function of Kainate receptors / Thromboxane signalling through TP receptor / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / G-protein activation / Glucagon signaling in metabolic regulation / G beta:gamma signalling through CDC42 / Prostacyclin signalling through prostacyclin receptor / GDP binding / Synthesis, secretion, and inactivation of Glucagon-like Peptide-1 (GLP-1) / photoreceptor disc membrane / G beta:gamma signalling through BTK / ADP signalling through P2Y purinoceptor 12 / Sensory perception of sweet, bitter, and umami (glutamate) taste / Glucagon-type ligand receptors / Adrenaline,noradrenaline inhibits insulin secretion / Vasopressin regulates renal water homeostasis via Aquaporins / G alpha (z) signalling events / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / ADP signalling through P2Y purinoceptor 1 / cellular response to catecholamine stimulus / G beta:gamma signalling through PI3Kgamma / ADORA2B mediated anti-inflammatory cytokines production / adenylate cyclase-activating dopamine receptor signaling pathway / cellular response to prostaglandin E stimulus / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / GPER1 signaling / heterotrimeric G-protein complex / G alpha (12/13) signalling events / Inactivation, recovery and regulation of the phototransduction cascade / G-protein beta-subunit binding / cell division / spindle pole / extracellular vesicle / Thrombin signalling through proteinase activated receptors (PARs) / adenylate cyclase-activating G protein-coupled receptor signaling pathway / signaling receptor complex adaptor activity / ciliary basal body / GTPase binding / midbody / G protein activity / cell cortex / Ca2+ pathway / High laminar flow shear stress activates signaling by PIEZO1 and PECAM1:CDH5:KDR in endothelial cells / G alpha (i) signalling events / G alpha (s) signalling events / G alpha (q) signalling events / Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement / cytoplasmic side of plasma membrane / Ras protein signal transduction / Extra-nuclear estrogen signaling / G protein-coupled receptor signaling pathway / lysosomal membrane / centrosome / GTPase activity / GTP binding / synapse / protein-containing complex binding / magnesium ion binding / signal transduction / extracellular exosome / membrane / nucleus
Similarity search - Function
: / G-protein alpha subunit, group I / G protein alpha subunit, helical insertion / G protein alpha subunit / Guanine nucleotide binding protein (G-protein), alpha subunit / G-protein alpha subunit / G-alpha domain profile. / G-protein, gamma subunit / G-protein gamma subunit domain profile. / G-protein gamma-like domain ...: / G-protein alpha subunit, group I / G protein alpha subunit, helical insertion / G protein alpha subunit / Guanine nucleotide binding protein (G-protein), alpha subunit / G-protein alpha subunit / G-alpha domain profile. / G-protein, gamma subunit / G-protein gamma subunit domain profile. / G-protein gamma-like domain / G-protein gamma-like domain superfamily / GGL domain / G protein gamma subunit-like motifs / GGL domain / Guanine nucleotide-binding protein, beta subunit / G protein beta WD-40 repeat protein / G-protein, beta subunit / G-protein coupled receptors family 1 signature. / 7 transmembrane receptor (rhodopsin family) / G protein-coupled receptor, rhodopsin-like / GPCR, rhodopsin-like, 7TM / G-protein coupled receptors family 1 profile. / G-protein beta WD-40 repeat / WD40 repeat, conserved site / Trp-Asp (WD) repeats signature. / Trp-Asp (WD) repeats profile. / Trp-Asp (WD) repeats circular profile. / WD40 repeats / WD40 repeat / WD40-repeat-containing domain superfamily / WD40/YVTN repeat-like-containing domain superfamily / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 / Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 / Guanine nucleotide-binding protein G(i) subunit alpha-1 / Hydroxycarboxylic acid receptor 2
Similarity search - Component
Biological speciesHomo sapiens (human) / Mus musculus (house mouse)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.5 Å
AuthorsZhao C / Tian XW / Liu Y / Cheng L / Yan W / Shao ZH
Funding support China, 1 items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC) China
CitationJournal: Mol Cell / Year: 2023
Title: Biased allosteric activation of ketone body receptor HCAR2 suppresses inflammation.
Authors: Chang Zhao / Heli Wang / Ying Liu / Lin Cheng / Bo Wang / Xiaowen Tian / Hong Fu / Chao Wu / Ziyan Li / Chenglong Shen / Jingjing Yu / Shengyong Yang / Hongbo Hu / Ping Fu / Liang Ma / ...Authors: Chang Zhao / Heli Wang / Ying Liu / Lin Cheng / Bo Wang / Xiaowen Tian / Hong Fu / Chao Wu / Ziyan Li / Chenglong Shen / Jingjing Yu / Shengyong Yang / Hongbo Hu / Ping Fu / Liang Ma / Chuanxin Wang / Wei Yan / Zhenhua Shao /
Abstract: Hydroxycarboxylic acid receptor 2 (HCAR2), modulated by endogenous ketone body β-hydroxybutyrate and exogenous niacin, is a promising therapeutic target for inflammation-related diseases. HCAR2 ...Hydroxycarboxylic acid receptor 2 (HCAR2), modulated by endogenous ketone body β-hydroxybutyrate and exogenous niacin, is a promising therapeutic target for inflammation-related diseases. HCAR2 mediates distinct pathophysiological events by activating G protein or β-arrestin effectors. Here, we characterize compound 9n as a G-biased allosteric modulator (BAM) of HCAR2 and exhibit anti-inflammatory efficacy in RAW264.7 macrophages via a specific HCAR2-G pathway. Furthermore, four structures of HCAR2-G complex bound to orthosteric agonists (niacin or monomethyl fumarate), compound 9n, and niacin together with compound 9n simultaneously reveal a common orthosteric site and a unique allosteric site. Combined with functional studies, we decipher the action framework of biased allosteric modulation of compound 9n on the orthosteric site. Moreover, co-administration of compound 9n with orthosteric agonists could enhance anti-inflammatory effects in the mouse model of colitis. Together, our study provides insight to understand the molecular pharmacology of the BAM and facilitates exploring the therapeutic potential of the BAM with orthosteric drugs.
History
DepositionMay 26, 2023-
Header (metadata) releaseSep 6, 2023-
Map releaseSep 6, 2023-
UpdateOct 23, 2024-
Current statusOct 23, 2024Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_36317.png

Downloads & links

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Map

FileDownload / File: emd_36317.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.92 Å/pix.
x 256 pix.
= 235.52 Å		0.92 Å/pix.
x 256 pix.
= 235.52 Å		0.92 Å/pix.
x 256 pix.
= 235.52 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.92 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.667
Minimum - Maximum-1.7844481 - 5.3738246
Average (Standard dev.)0.011389226 (±0.07845448)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions256256256
Spacing256256256
CellA=B=C: 235.52 Å
α=β=γ: 90.0 °

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Supplemental data

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Additional map: The consensus map

Fileemd_36317_additional_1.map
AnnotationThe consensus map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : niacin-bound HCAR2 in complex with Gi heterotrimer

EntireName: niacin-bound HCAR2 in complex with Gi heterotrimer
Components
  • Complex: niacin-bound HCAR2 in complex with Gi heterotrimer
    • Complex: Nicotinic acid receptor in complex with Gi heterotrimer
      • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
      • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
      • Protein or peptide: Guanine nucleotide-binding protein G(i) subunit alpha-1
      • Protein or peptide: Hydroxycarboxylic acid receptor 2
    • Complex: scFv16
      • Protein or peptide: scFv16
  • Ligand: NICOTINIC ACID
  • Ligand: CHOLESTEROL
  • Ligand: water

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Supramolecule #1: niacin-bound HCAR2 in complex with Gi heterotrimer

SupramoleculeName: niacin-bound HCAR2 in complex with Gi heterotrimer / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#5

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Supramolecule #2: Nicotinic acid receptor in complex with Gi heterotrimer

SupramoleculeName: Nicotinic acid receptor in complex with Gi heterotrimer
type: complex / ID: 2 / Parent: 1 / Macromolecule list: #1-#3, #5
Source (natural)Organism: Homo sapiens (human)

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Supramolecule #3: scFv16

SupramoleculeName: scFv16 / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #4
Source (natural)Organism: Mus musculus (house mouse)

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Macromolecule #1: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1

MacromoleculeName: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 39.141793 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MHHHHLEVLF QGPGSSGSEL DQLRQEAEQL KNQIRDARKA CADATLSQIT NNIDPVGRIQ MRTRRTLRGH LAKIYAMHWG TDSRLLVSA SQDGKLIIWD SYTTNKVHAI PLRSSWVMTC AYAPSGNYVA CGGLDNICSI YNLKTREGNV RVSRELAGHT G YLSCCRFL ...String:
MHHHHLEVLF QGPGSSGSEL DQLRQEAEQL KNQIRDARKA CADATLSQIT NNIDPVGRIQ MRTRRTLRGH LAKIYAMHWG TDSRLLVSA SQDGKLIIWD SYTTNKVHAI PLRSSWVMTC AYAPSGNYVA CGGLDNICSI YNLKTREGNV RVSRELAGHT G YLSCCRFL DDNQIVTSSG DTTCALWDIE TGQQTTTFTG HTGDVMSLSL APDTRLFVSG ACDASAKLWD VREGMCRQTF TG HESDINA ICFFPNGNAF ATGSDDATCR LFDLRADQEL MTYSHDNIIC GITSVSFSKS GRLLLAGYDD FNCNVWDALK ADR AGVLAG HDNRVSCLGV TDDGMAVATG SWDSFLKIWN

UniProtKB: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1

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Macromolecule #2: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2

MacromoleculeName: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 7.861143 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString:
MASNNTASIA QARKLVEQLK MEANIDRIKV SKAAADLMAY CEAHAKEDPL LTPVPASENP FREKKFFCAI L

UniProtKB: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2

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Macromolecule #3: Guanine nucleotide-binding protein G(i) subunit alpha-1

MacromoleculeName: Guanine nucleotide-binding protein G(i) subunit alpha-1
type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 40.414047 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MGCTLSAEDK AAVERSKMID RNLREDGEKA AREVKLLLLG AGESGKNTIV KQMKIIHEAG YSEEECKQYK AVVYSNTIQS IIAIIRAMG RLKIDFGDSA RADDARQLFV LAGAAEEGFM TAELAGVIKR LWKDSGVQAC FNRSREYQLN DSAAYYLNDL D RIAQPNYI ...String:
MGCTLSAEDK AAVERSKMID RNLREDGEKA AREVKLLLLG AGESGKNTIV KQMKIIHEAG YSEEECKQYK AVVYSNTIQS IIAIIRAMG RLKIDFGDSA RADDARQLFV LAGAAEEGFM TAELAGVIKR LWKDSGVQAC FNRSREYQLN DSAAYYLNDL D RIAQPNYI PTQQDVLRTR VKTTGIVETH FTFKDLHFKM FDVGAQRSER KKWIHCFEGV TAIIFCVALS DYDLVLAEDE EM NRMHASM KLFDSICNNK WFTDTSIILF LNKKDLFEEK IKKSPLTICY PEYAGSNTYE EAAAYIQCQF EDLNKRKDTK EIY THFTCS TDTKNVQFVF DAVTDVIIKN NLKDCGLF

UniProtKB: Guanine nucleotide-binding protein G(i) subunit alpha-1

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Macromolecule #4: scFv16

MacromoleculeName: scFv16 / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 28.636793 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: DVQLVESGGG LVQPGGSRKL SCSASGFAFS SFGMHWVRQA PEKGLEWVAY ISSGSGTIYY ADTVKGRFTI SRDDPKNTLF LQMTSLRSE DTAMYYCVRS IYYYGSSPFD FWGQGTTLTV SSGGGGSGGG GSGGGGSDIV MTQATSSVPV TPGESVSISC R SSKSLLHS ...String:
DVQLVESGGG LVQPGGSRKL SCSASGFAFS SFGMHWVRQA PEKGLEWVAY ISSGSGTIYY ADTVKGRFTI SRDDPKNTLF LQMTSLRSE DTAMYYCVRS IYYYGSSPFD FWGQGTTLTV SSGGGGSGGG GSGGGGSDIV MTQATSSVPV TPGESVSISC R SSKSLLHS NGNTYLYWFL QRPGQSPQLL IYRMSNLASG VPDRFSGSGS GTAFTLTISR LEAEDVGVYY CMQHLEYPLT FG AGTKLEL KAAAENLYFQ GHHHHHHHH

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Macromolecule #5: Hydroxycarboxylic acid receptor 2

MacromoleculeName: Hydroxycarboxylic acid receptor 2 / type: protein_or_peptide / ID: 5 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 46.034066 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MKTIIALSYI FCLVFADYKD DDDAHHHHHH HHHHMNRHHL QDHFLEIDKK NCCVFRDDFI VKVLPPVLGL EFIFGLLGNG LALWIFCFH LKSWKSSRIF LFNLAVADFL LIICLPFLMD NYVRRWDWKF GDIPCRLMLF MLAMNRQGSI IFLTVVAVDR Y FRVVHPHH ...String:
MKTIIALSYI FCLVFADYKD DDDAHHHHHH HHHHMNRHHL QDHFLEIDKK NCCVFRDDFI VKVLPPVLGL EFIFGLLGNG LALWIFCFH LKSWKSSRIF LFNLAVADFL LIICLPFLMD NYVRRWDWKF GDIPCRLMLF MLAMNRQGSI IFLTVVAVDR Y FRVVHPHH ALNKISNRTA AIISCLLWGI TIGLTVHLLK KKMPIQNGGA NLCSSFSICH TFQWHEAMFL LEFFLPLGII LF CSARIIW SLRQRQMDRH AKIKRAITFI MVVAIVFVIC FLPSVVVRIR IFWLLHTSGT QNCEVYRSVD LAFFITLSFT YMN SMLDPV VYYFSSPSFP NFFSTLINRC LQRKMTGEPD NNRSTSVELT GDPNKTRGAP EALMANSGEP WSPSYLGPTS P

UniProtKB: Hydroxycarboxylic acid receptor 2

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Macromolecule #6: NICOTINIC ACID

MacromoleculeName: NICOTINIC ACID / type: ligand / ID: 6 / Number of copies: 1 / Formula: NIO
Molecular weightTheoretical: 123.109 Da
Chemical component information

ChemComp-NIO:
NICOTINIC ACID

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Macromolecule #7: CHOLESTEROL

MacromoleculeName: CHOLESTEROL / type: ligand / ID: 7 / Number of copies: 1 / Formula: CLR
Molecular weightTheoretical: 386.654 Da
Chemical component information

ChemComp-CLR:
CHOLESTEROL

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Macromolecule #8: water

MacromoleculeName: water / type: ligand / ID: 8 / Number of copies: 1 / Formula: HOH
Molecular weightTheoretical: 18.015 Da
Chemical component information

ChemComp-HOH:
WATER

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 7.5
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 65.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 1.8 µm / Nominal defocus min: 1.0 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: NONE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.5 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 519609
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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